@misc{indiciaedf52eb325b5e,
  title = {Karst topography; computer animations and paper model},
  author = {T. R. Alpha and John P. Galloway and J. C. Tinsley},
  year = {1997},
  doi = {10.3133/ofr97536a},
  url = {https://pubs.usgs.gov/publication/ofr97536A},
  note = {Source identifier: ofr97536A}
}